| Tournament | Round | Gwen Chadwick | Mary McMahon |
| 21.02.1999 Camberwell (VIC) | 6 | 415 | 325 |
| 14.06.1999 Victorian Championships (VIC) | 14 | 360 | 372 |
| 12.06.2000 Victorian Championships (VIC) | 5 | 396 | 333 |
| 03.12.2000 McKinnon (VIC) | 4 | 335 | 406 |
| 09.06.2001 Victorian Championships (VIC) | 21 | 383 | 363 |
| 30.09.2001 Essendon (VIC) | 1 | 442 | 433 |
| 10.06.2002 Victorian Championships (VIC) | 13 | 350 | 435 |
| 01.12.2002 McKinnon (VIC) | 6 | 459 | 435 |
| 15.01.2006 Aestival (VIC) | 7 | 359 | 355 |
| 10.12.2006 McKinnon 2006 (VIC) | 4 | 368 | 365 |
| 21.01.2007 AESTIVAL FESTIVAL 2007 (VIC) | 6 | 282 | 350 |
| Head-to-head after 11 games | 7 | 4 | |
| Average score | 377.18 | 379.27 | |
| Spread: | -23 | 23 | |